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永久虚电路(PVC:Permtnent Vrtual Circuit) 它是端点和业务类别由网络管理定义的帧中继逻辑链路。与X.25永久虚电路相类似PVC由始发帧中继网络元素地址、始发数据链路控标识、终接帧中继网络元素地址和终接数据链路控制标识组成。始发是指启动PVC的接入接口,终接是指PVC终上的接入接口。许多数据网络客户需要两个端点之间的PVC。有连接通信需求的数据终端设备使用PVC。
PVC: Permtnent Vrtual Circuit It is a Frame Relay logical link defined by network management for endpoints and traffic classes. Similar to the X.25 PVC, the PVC consists of the originating frame relay network element address, the originating data link control identity, the terminating frame relay network element address, and the terminating data link control identity. Initiation refers to starting the PVC access interface, termination refers to the PVC terminal access interface. Many data network clients require PVC between two endpoints. The data terminal equipment that needs to connect to communicate needs to use PVC.